Thanks @jim-dutton and @kerry for the extensive help. I am really starting to get a good view on the pro's and con's of guitars and this small one in particular. I would like to enquire just a bit further about the splitting of the plastic. Can you tell me more about it? How does the splitting occur?

I would mainly use the guitar for softer fillings, like fruit jelly, marshmallow and soft ganache.

The splitting happens when the wire cuts the plastic. Sometimes the wires get deflected in their decent and they can damage the plastic.

I have a small Dedy - it's a beautiful thing! The large Dedy was as well - it's in use elsewhere these days. I know that one of the eGullet Matt's has a small Martellato and he has found it works well for what he does. The Martellato actually has a slightly larger bed than the Dedy so cuts more pieces for the size which is an advantage I'd say. It's not a double though.

The objection I have to the Martellato's is the plastic - I've seen some where the raised plastic edge gets splits in it - then it is the thing that catches then breaks the wires as they come down.

Changing a wire is tedious initially - you get better at it. But I have not broken a lot of them over time, by watching what I'm cutting as Jim mentions above.

Much improved at 30º C. Wish the pictures did a better job of showing how lovely the crystals are on the left picture. I'll try to carefully chip away at the overlying crust to reveal the underlying crystals after I'm convinced it's completely dry and finished growing.

I've never completely convinced myself that I clearly know what a truffle is vs a bonbon. I tend to think of the little (and I do mean little) one bite ganaches shaped like the thing that pigs dig up in France - to be a truffle. A cut piece made from ganache might also qualify. And when I pipe a ganache into a shell - I might call it a truffle filling.

Looks perhaps like your chocolate was over crystallized and relatively cool when you put it behind the colours. Having it as warm as possible will aid it in it's bonding with the coloured layer and when it is over crystallized it doesn't contract as well and pull away from the mold.

I'd clean the molds with very hot water and a soft cotton mop like a vase brush.

I would suggest a bit of time in the fridge when the chocolate is beginning to show signs of crystallizing around the edges - when it starts to crystallize rapidly it gives off the latent heat of crystallization and can get warm enough to throw itself out of temper in spots. Depending on the size and thickness of the bar you are making - this can be 10 to 30 minutes. You don't want to leave the chocolate in the fridge until it cools completely or water will condense on the surface and cause sugar bloom when it evaporates.

I'm a big fan of the Fuji - www.fujispray.com - they are putting together a chocolate system these days after I started referring a lot of chocolatiers there. They do go through the cocoa butter - but they are fast - and time is money.

I've been making some of my own coloured cocoa butters using the IBC Power Flowers - you can get consistent colours using their palette to mix.

Tim - for your own as you suggest just decrease your added cocoa butter by 1% and add 1% silk.

Using commercial couverture I just add the 1% at the tail end - not worrying about the additional cocoa butter. If I've put aside a little bit of dark chocolate for painting eyes on bunnies I have often added a whole lot of 1%'s when I reheat and temper over and over and sometimes end up with pretty thin chocolate! But it still works fine on the eyes!

Today I tempered a batch of bean to bar that isn't two ingredient by just adding the 1% - here's a picture of it.

The silk is indeed just cocoa butter with no additional ingredients - in a form that will provide a sufficient amount of form V crystals to almost instantly temper your chocolate. If you are making bean to bar with lecithin you would add it whenever you normally add it to your chocolate under construction. The 'silk' is added at the very end when you are ready to mold your product.

Potomac Chocolate:Therein lies the reason why I've only given some thought vs. executed the idea. With my limited space, I don't have space for a real press and I'm not sure if one of the little olive oil presses would work.

So I experimented a bit today - made some liquor from nibs in an Indian spice grinder, added water, then cooked down until it 'cracked' and the cocoa butter separated out.

I can't seem to get the pictures in order - but I ended up with around 20 grams of cocoa butter. You can see in the 3rd picture the butter starting to separate, then in the second one a little puddle of butter at around 11 o'clock.

I think a lot of people purchase the Revolation machines not realizing that they depend on well tempered chocolate as part of the process - and as Michael points out - that's the catch-22 of bean to bar - if you could temper your chocolate you wouldn't need the machine!

I'm not sure if you add additional cocoa butter to your bean to bar chocolate - but one of the things that many bean to bar producers have found is that their chocolate is too viscous for an automatic temperer. Another issue with the smaller automatic temperers (such as the Revolation) is that they require tempered seed chocolate placed behind the baffle to temper your chocolate - and most bean to bar manufacturers don't have tempered chocolate to use for this.

So to start - clean one of the stainless containers - fill it with cocoa butter and place in the EZtemper overnight. Give it a stir in the morning and make sure it has reached a creamy consistancy.

Weigh and melt some of your bean to bar chocolate - let cool to 33.5 degrees C and add 1% of the weight of the chocolate of cocoa butter silk. Give it a stir. It will be tempered and ready to use. If you are molding it into bars I'd suggest that as soon as you see evidence of crystallization around the edges that you put the bar molds into the fridge for 10 to 15 minutes to carry off the latent heat of crystallization.